def load(filename):
	'''
	Load data from a file.

	@param filename: file to load

	@return: a ScreenSpec instance
	'''
	raise Exception("unsupported")

def save(data, filname):
	'''
	Save data to a file.

	@param data: a ScreenSpec instance
	@patam filename: file
	'''
	raise Exception("unsupported")
